Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 69
d a he, {Fig. 96,) aretogether equal to two right angles, {Art. 130, 133;) also, thethree angles, ah d, eh a and cb e, are together equal to two rightangles. 138.—Corollary. Hence all the angles that can be made uponone side of a line, meeting in a point in that line, are togetherequal to two right… … b d
Carpentry · Architecture
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